Posted by **sherry** on Thursday, February 16, 2012 at 9:16am.

a ball is dropped from a height of 10 meters.if the energy of the ball is reduced by 40% after striking the ground,how high can the ball bounce back?

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**drwls**, Thursday, February 16, 2012 at 9:38am
It can bounce to 40% of the original height, or 4 meters in this case.

- physics -
**Elena**, Thursday, February 16, 2012 at 11:09am
If the energy is reduced by 40%, then 60% is left. Therefore, PE = mgH = KE (at hitting the ground). Upward motion

0.6KE=0.6mgH = mgh. Then h=0.6x10=6 m.

- physics -
**drwls**, Thursday, February 16, 2012 at 11:11am
Yes, I misread the question. 60% of the original height is correct

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